What it is:
Box 28 is used to indicate the total billed amount for all services entered in Box 24f (lines 1–6). Enter total charges for the services (i.e., total of all charges in 24F). Enter the number right justified in the dollar area of the field. Do not use commas when reporting dollar amounts. Negative dollar amounts are not allowed. Dollar signs should not be entered. Enter 00 in the cents area if the amount is a whole number.
Therabill will use the total amount of all services entered into the Billing & Coding section of the Edit Session dialog to populate box 28. You cannot enter this amount directly. It will be calculated based on the charges entered for each of the services performed.
From the dashboard click on the green New Session button. You will be on the Entering New Session page. Enter the service code and modifiers in the Service Code and Modifier fields for each of the services that will be/were performed.